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- W2014086809 abstract "The reactions which occur when dicalcium ferrite and tetracalcium alumino-ferrite are exposed to saturated steam at temperatures between 100° and 300 °C. were studied by determining the water absorbed and the optical properties and X-ray diffraction patterns of the products. The hydration of the probable products of decomposition under the same conditions was also studied. The main results were as follows:Precipitated alumina, treated between 170° and 350 °C. and then dried over calcium oxide or dehydrite at 21 °C., gives a monohydrate of alumina. The product is the same whether the initial alumina contains excess combined water or has been dehydrated at any temperature below about 920 °C. On similar treatment between 100° and 170 °C. precipitated ferric oxide loses its water of hydration, giving a material with the crystalline structure of hematite. Tricalcium aluminate at temperatures between 150° and 300 °C. forms the isometric hexahydrate.On prolonged exposure between 100° and 300 °C, dicalcium ferrite is completely decomposed to calcium hydroxide and ferric oxide (hematite). The first step appears to be a rapid direct hydration of the dicalcium ferrite to a dihydrate, followed by a rapid liberation of one mole of calcium hydroxide. Then follows a slow decomposition of the hydrated monocalcium ferrite with the formation of hematite.Similar treatment of tetracalcium aluminoferrite at temperatures from 100° to 300 °C. gives as final products the hexahydrate of tricalcium aluminate, calcium hydroxide, and ferric oxide (hematite). Here again a very rapid action appears to take place, producing the hexahydrate of tricalcium aluminate and hydrated monocalcium ferrite, the latter product then decomposing slowly to calcium hydroxide and ferric oxide as in the case of the dicalcium ferrite." @default.
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- W2014086809 date "1937-08-01" @default.
- W2014086809 modified "2023-09-25" @default.
- W2014086809 title "THE ACTION OF SATURATED STEAM ON DICALCIUM FERRITE AND ON TETRACALCIUM ALUMINOFERRITE" @default.
- W2014086809 doi "https://doi.org/10.1139/cjr37b-036" @default.
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